Chap. 22/23

Question 1

Large Diameter leads to faster Conduction because….

Answer 1

Lower Internal R

Question 2

SA1

• location
• Stimulus
• RF
• Threshold

Answer 2

Merkel

• sweat ridges -finer tips
• indentation, edges,points
• 1 (smallest)
• 8 um

Question 3

SA2

• location
• Stimulus
• RF
• Threshold

Answer 3

Ruffinian

• Dermis - joints, palms
• lateral displacement, stretch
• 3
• 40 (least sensitive)

Question 4

RA1

• location
• Stimulus
• RF
• Threshold

Answer 4

Messiners

• ridges
• Lateral motion
• 2
• 2 um

Question 5

RA2

• location
• Stimulus
• RF
• Threshold

Answer 5

pacinian

• deep dermis
• vibration
• 4 (largest)
• 0.01 (most sensitive)

Question 6

LT cooling Receptor

• fiber
• range

Answer 6

TRPM8

• Ag
• only physio temps - high fire rate at temp drop/raise

Question 7

HT cooling Receptor

• fiber
• range

Answer 7

TRPA1

• Ag?
• cold temps (less sensitive to small changes)

Question 8

Warm Receptor

• fiber
• range

Answer 8

TRPV3

• C fibers
• warm not hot range

Question 9

Heat Receptor

• fiber
• range

Answer 9

TRPV1/2

• Ag fibers
• mechanoheat receptors - respond to temp and pinch
• may attinuate response if primed (TRPV2)

Question 10

Itch receptors

Answer 10

Coupled with His

C fibers

Question 11

dermatome

Answer 11

skin/tissue innervated by the same nerve bundle

Question 12

Gracile Faciculus

Answer 12

Contains durmatomes from T7 + down (lumbar axons)

medial position in Drosal column

Question 13

Cuneate Faciculus

Answer 13

Durmatomes T6 and up (excluding face/head)

Laterally positioned

Question 14

Somatopy in Dorsal Column

Answer 14

Medial - lumbar
- Thoracic
Lateral - cervical

Question 15

Dorsal Column _Medial Lamniscal

Answer 15

Proprioceptive info

tactile info

Question 16

Nucleus Gracilis

Answer 16

In medulla
Termination point (1st synapse) for GF

–> onto crossing over

Question 17

Nucleus Cuneatus

Answer 17

In medulla
Termination point (1st synapse) for CF

–> onto crossing over